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LM318-N: LM318-N General operational amplifier circuit

Weicheng Lee
Prodigy 10 points
Part Number: LM318-N
Other Parts Discussed in Thread: LM318, TL071H, LM741

Tool/software:

Hi,

I am trying to build the non-inverting amplifier circuit using LM318-N. I attached the circuit schematics below. The input is using pulse generator with amplitude 2V and frequency 10 kHz. The circuit is quite simple and the output should be straight forward. However, the output is kind of weird since it's just the negative supply voltage (also attached). I am wondering if it is the right op amp for this application or I need another amp to build the circuit like this. Thanks.

Best,

Leo

  

  • 0
    TI__Guru* 77541 points

    Hi Weicheng,

    You can use TL071H to work with the application. Since the output swing up to 22V, you would need a faster slew rate op amp to handle the application. 

    TL074H 10kHz 03132025.TSC

    LM318 10kHz 03132025.TSC

    If you have other questions, please let me know. 

    Best,

    Raymond

  • 0 in reply to Raymond Zhang1
    Prodigy 10 points

    Hi Raymond,

    Thanks for your response and suggestions. It seems that your simulation of the LM318 shows it can amplify the input voltage, but not to a high enough level. I also tried using R2 = 3kΩ, which should provide a 4x voltage gain, but the output response still looks the same as the one I previously attached.

    I’ll go ahead and test the circuit using the TL071H as well. Additionally, we need to amplify another signal from 0.7V to 3V while maintaining the same frequency. Would the TL071H be a good choice for this application? Also, would the LM741 be suitable for this purpose?

    Thanks,

    Weicheng

  • 0 in reply to Weicheng Lee
    TI__Guru* 77541 points

    Hi Weicheng,

    TL071H would be better choice. LM741 is too old design and there is no significant cost differences, since these are all general purpose op amps. We have many many other general purpose and precision op amps. Each one is tailored for certain applications. General purpose means that it is for general uses for design application. 

    If you have other questions, please let me know. 

    Best,

    Raymond